Howarth, 36, and Henslee, 30, were murdered on Jan. 24, 2011, and their bodies were found three days later by police buried in a shallow grave next to Beebe’s trailer in rural Van Buren County.

A jury found Beebe, 36, guilty in August 2011 of second-degree murder in Henslee’s slaying and of first-degree premeditated murder of Howarth. He was later sentenced to life in prison without the chance of parole.

Beebe, who is currently housed at the Earnest C. Brooke Correctional Facility in Muskegon Heights, also was found guilty of two counts of felony use of a firearm.

“Defendant’s challenge in relation to Amy must fail because it is based on witness credibility,” the judges said in the ruling. “Defendant is the only living witness to the shooting. He alone claimed that Howarth shot Amy and the jury disbelieved his tale.

“Supporting the jury’s verdict, the forensic team found only defendant’s DNA on the .410 rifle used to shoot Amy. Additionally, defendant’s deceptive actions following Amy’s death, including his attempts to hide the bodies and clean up the scene, his false declarations of ignorance regarding Amy’s whereabouts, and his feigned pleas for information from the public evidence ‘consciousness of guilt.’”